Non-local electrodynamics of superconducting wires: implications for flux noise and inductance

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dc.contributor.authorSenarath Yapa Arachchige, Pramodh Viduranga
dc.contributor.supervisorDe Sousa, Rogério Costa Reis
dc.date.accessioned2017-12-22T19:59:29Z
dc.date.available2017-12-22T19:59:29Z
dc.date.copyright2017en_US
dc.date.issued2017-12-22
dc.degree.departmentDepartment of Physics and Astronomyen_US
dc.degree.levelMaster of Science M.Sc.en_US
dc.description.abstractThe simplest model for superconductor electrodynamics are the London equations, which treats the impact of electromagnetic fields on the current density as a localized phenomenon. However, the charge carriers of superconductivity are quantum mechanical objects, and their wavefunctions are delocalized within the superconductor, leading to non-local effects. The Pippard equation is the generalization of London electrodynamics which incorporates this intrinsic non-locality through the introduction of a new superconducting characteristic length, \xi_0, called the Pippard coherence length. When building nano-scale superconducting devices, the inclusion of the coherence length into electrodynamics calculations becomes paramount. In this thesis, we provide numerical calculations of various electrodynamic quantities of interest in the non-local regime, and discuss their implications for building superconducting devices. We place special emphasis on Superconducting QUantum Inteference Devices (SQUIDs), and their usage as flux quantum bits (qubits) in quantum computation. One of the main limitations of these flux qubits is the presence of intrinsic flux noise, which leads to decoherence of the qubits. Although the origin of this flux noise is not known, there is evidence that it is related to spin impurities within the superconducting material. We present calculations which show that the flux noise in the non-local regime is signi cantly different from the local case. We also demonstrate that non-local electrodynamics greatly affect the self-inductance of the qubit.en_US
dc.description.scholarlevelGraduateen_US
dc.identifier.urihttp://hdl.handle.net/1828/8914
dc.languageEnglisheng
dc.language.isoenen_US
dc.rightsAvailable to the World Wide Weben_US
dc.subjectsuperconductivityen_US
dc.subjectquantum computingen_US
dc.subjectqubiten_US
dc.subjectflux noiseen_US
dc.subjectelectrodynamicsen_US
dc.subjectSQUIDen_US
dc.subjectSuperconductoren_US
dc.subjectPipparden_US
dc.subjectnon-local electrodynamicsen_US
dc.subjectinductanceen_US
dc.titleNon-local electrodynamics of superconducting wires: implications for flux noise and inductanceen_US
dc.typeThesisen_US

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